SLC4A7 and head and neck squamous cell carcinoma: Moreover, SLC4A7 has also been reported to promote EMT and metastasis of the head and neck squamous cell carcinoma; similarly, pHi dynamics studies as well as mRNA and protein expression of acid-base transporters among breast cancer patients showed that increased SLC4A7 expression predicts proliferative activity and metastasis [50,51].